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The UMS WH220N (or WH220-N) is a specialized high-load switch designed for appliances that draw significant power, primarily electric water heaters and air conditioning units.
Unlike standard lighting switches, this is a Double Pole (DP) switch, meaning it cuts off both the Live and Neutral wires simultaneously for enhanced safety.
Technical Specifications
| Feature |
Details |
| Model |
WH220N / WH220-N |
| Current Rating |
20A (Heavy Duty) |
| Voltage |
250V AC |
| Switch Type |
1 Gang 1-Way Double Pole (DP) |
| Indicator |
Red Neon Light (Lights up when the switch is ON) |
| Material |
High-grade Bakelite or Polycarbonate (Heat Resistant) |
| Certification |
SIRIM Approved (MS IEC 60669-1) |
| Dimensions |
Standard 3" x 3" ($86text{mm} times 86text{mm}$) |
Key Features
-
Double Pole Safety: Because water heaters are used in wet environments, the DP mechanism ensures total isolation from the electricity supply when turned off, preventing any "leakage" current.
-
Neon Indicator: A built-in red lamp provides a clear visual signal that the appliance is receiving power, which is helpful for verifying if a heater is accidentally left on.
-
Heat Resistance: Built using materials designed to withstand the heat generated by a continuous 20A current flow without melting or deforming.
-
Universal Fit: Fits into standard $3text{x}3$ PVC or metal concealed boxes, making it an easy replacement for old heater switches.
Installation & Compatibility
-
Best For: Instant water heaters (typically 3kW to 4.5kW) and Air Conditioners (up to 2.0hp or 2.5hp depending on total wattage).
-
Wiring: Requires 2.5mm² or 4.0mm² cable to handle the 20A load safely.
-
Screw Terminals: The WH220N typically uses larger screw terminals to accommodate the thicker wiring required for high-load appliances.
Safety Tip: If you notice the switch or the wall around it feels hot to the touch, or if the neon light starts flickering, it may indicate a loose connection or an aging internal contact. These should be replaced immediately to prevent fire hazards.
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